It’s based on a PIC16F628A microcontroller, which only has 3.5kbytes of flash and a mere 224 bytes of RAM. For comparison, Boris (one of the first consumer chess computers), utilized an 8-bit microprocessor with 2.5 kbytes of ROM and 256 bytes of RAM.

PIC Blitz has a full fledged chess library: it knows all the moves, all the basic openings and even changes its evaluation function weights as the game progresses to keep the game interesting. The creator [Mark Owen] quips about some of the additional techniques he utilized to make up for the limited processing power; including “pondering time”, a difficult and slow user interface, and of course, a barely-comprehensible LCD.

If you’re interested he has released the files under Creative Commons, and has a link to the PCB layout on the project page – we won’t link it directly though, since it goes straight to a download.